Granted Patent
Utility
US 5,728,655 · App. 08/588,701
Refrigerating machine oil composition for use with HCFC and HFC refrigerants
Inventors:
Masayoshi Muraki, Yukiharu Beppu, Shozaburo Konishi, Takayoshi Hamada, Nobuo Murata, Norimasa Nishiura
Patented Case
View Patent ↗
Granted: Mar 17, 1998
Filed: Jan 19, 1996
Inventors
Masayoshi Muraki
Yukiharu Beppu
Shozaburo Konishi
Takayoshi Hamada
Nobuo Murata
Norimasa Nishiura
Assignees (at issue)
Mitsubishi Oil Co., Ltd.
MITSUBISHI KOGYO KABUSHIKI KAISHA
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.